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MODIFICATION OF NASAL RESONANCE IN CLEFT‐PALATE CHILDREN BY INFORMATIVE FEEDBACK 1
Author(s) -
Roll David L.
Publication year - 1973
Publication title -
journal of applied behavior analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.1
H-Index - 76
eISSN - 1938-3703
pISSN - 0021-8855
DOI - 10.1901/jaba.1973.6-397
Subject(s) - psychology , autism , audiology , developmental psychology , medicine
Vibration of the walls of the nasal cavities during production of an English vowel or diphthong defined a hypernasal response. A crystal transducer on one side of the nose activated a voice‐operated relay when vibration exceeded an arbitrary limit to provide an apparatus definition of the response. During training sessions, responses without nasal vibration turned on a white light in the sound‐treated chamber. Subject 1 had a repaired cleft palate and mild hypernasal speech. Introduction of the differential feedback, reversal, and reinstatement of the feedback conditions resulted in a rapid decrease, increase, and decrease in percentage of nasalized productions of the /eI/ sound Subject 2 had a cleft of the soft palate and severe hypernasal speech. Introduction of feedback produced a gradual decline in the percentage of hypernasal productions of the sound over 22 sessions. Removal and reinstatement of feedback resulted in a rapid increase and decrease respectively in the percentage of nasalized responses.